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  <a href="http://sudopedia.enjoysudoku.com/W-Wing.html">W-Wing</a>
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    The two <b>cells {1} and {2}</b> have a <a href="http://sudopedia.enjoysudoku.com/Strong_link.html">strong link</a> on <b>digit {5}</b> (the x value).<br> 
    A strong link between 2 candidates exists if at least one of them must be true.<br>
    In this case the link is strong because the two cells are the only cells in <b>{6}</b> containing the <b>candidate {5}</b>.<br>
    If one of the <b>cells {1} or {2}</b> must be a <b>{5}</b> then either <b>cell {0}</b> or <b>cell {3}</b> cannot be <b>{5}</b> but must contain a <b>{4}</b> (the w value)</b>.<br> 
    None of the cells seen by these two cells can therefore contain <b>digit {4}</b> as a candidate.
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